Can I specify my own private key for my Dropbox?

To ensure everyone has the ability to view and share files on the web painlessly, Dropbox currently does not support the creation of your own private keys. However, allowing user control over this is something we might consider adding in the future.

For our advanced users

While Dropbox does not provide for client-side encryption users are free to add their own. There are many third party applications that provide encryption at both the file and container level. Visit our forums for more information.